diff --git a/nlp b/nlp
index 4390af9..47b0388 100755
--- a/nlp
+++ b/nlp
@@ -89,6 +89,7 @@ class NLPPipeline(WorkflowRunner):
         ' # vrt creation                                   #
         ' ##################################################
         '''
+        vrt_creation_tasks = []
         for i, job in enumerate(self.jobs):
             output_file = os.path.join(job.output_dir, '{}.vrt'.format(job.name))  # noqa
             nlp_file = os.path.join(job.output_dir, '{}.nopaque-stand-off.json'.format(job.name))  # noqa
@@ -99,6 +100,7 @@ class NLPPipeline(WorkflowRunner):
             deps = 'nlp_-_{}'.format(i)
             lbl = 'vrt_creation_-_{}'.format(i)
             task = self.addTask(command=cmd, dependencies=deps, label=lbl)
+            vrt_creation_tasks.append(task)
 
         '''
         ' ##################################################
@@ -116,7 +118,7 @@ class NLPPipeline(WorkflowRunner):
             cmd += ' -i "*.vrt" "*.json"'
             cmd += ' && '
             cmd += 'cd -'
-            deps = nlp_tasks
+            deps = vrt_creation_tasks
             lbl = 'zip_creation'
             task = self.addTask(command=cmd, dependencies=deps, label=lbl)
             zip_creation_tasks.append(task)